tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1#include <linux/kernel.h>
2#include <linux/ide.h>
3
4int generic_ide_suspend(struct device *dev, pm_message_t mesg)
5{
6 ide_drive_t *drive = dev->driver_data, *pair = ide_get_pair_dev(drive);
7 ide_hwif_t *hwif = drive->hwif;
8 struct request *rq;
9 struct request_pm_state rqpm;
10 struct ide_cmd cmd;
11 int ret;
12
13 /* call ACPI _GTM only once */
14 if ((drive->dn & 1) == 0 || pair == NULL)
15 ide_acpi_get_timing(hwif);
16
17 memset(&rqpm, 0, sizeof(rqpm));
18 memset(&cmd, 0, sizeof(cmd));
19 rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
20 rq->cmd_type = REQ_TYPE_PM_SUSPEND;
21 rq->special = &cmd;
22 rq->data = &rqpm;
23 rqpm.pm_step = IDE_PM_START_SUSPEND;
24 if (mesg.event == PM_EVENT_PRETHAW)
25 mesg.event = PM_EVENT_FREEZE;
26 rqpm.pm_state = mesg.event;
27
28 ret = blk_execute_rq(drive->queue, NULL, rq, 0);
29 blk_put_request(rq);
30
31 /* call ACPI _PS3 only after both devices are suspended */
32 if (ret == 0 && ((drive->dn & 1) || pair == NULL))
33 ide_acpi_set_state(hwif, 0);
34
35 return ret;
36}
37
38int generic_ide_resume(struct device *dev)
39{
40 ide_drive_t *drive = dev->driver_data, *pair = ide_get_pair_dev(drive);
41 ide_hwif_t *hwif = drive->hwif;
42 struct request *rq;
43 struct request_pm_state rqpm;
44 struct ide_cmd cmd;
45 int err;
46
47 /* call ACPI _PS0 / _STM only once */
48 if ((drive->dn & 1) == 0 || pair == NULL) {
49 ide_acpi_set_state(hwif, 1);
50 ide_acpi_push_timing(hwif);
51 }
52
53 ide_acpi_exec_tfs(drive);
54
55 memset(&rqpm, 0, sizeof(rqpm));
56 memset(&cmd, 0, sizeof(cmd));
57 rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
58 rq->cmd_type = REQ_TYPE_PM_RESUME;
59 rq->cmd_flags |= REQ_PREEMPT;
60 rq->special = &cmd;
61 rq->data = &rqpm;
62 rqpm.pm_step = IDE_PM_START_RESUME;
63 rqpm.pm_state = PM_EVENT_ON;
64
65 err = blk_execute_rq(drive->queue, NULL, rq, 1);
66 blk_put_request(rq);
67
68 if (err == 0 && dev->driver) {
69 struct ide_driver *drv = to_ide_driver(dev->driver);
70
71 if (drv->resume)
72 drv->resume(drive);
73 }
74
75 return err;
76}
77
78void ide_complete_power_step(ide_drive_t *drive, struct request *rq)
79{
80 struct request_pm_state *pm = rq->data;
81
82#ifdef DEBUG_PM
83 printk(KERN_INFO "%s: complete_power_step(step: %d)\n",
84 drive->name, pm->pm_step);
85#endif
86 if (drive->media != ide_disk)
87 return;
88
89 switch (pm->pm_step) {
90 case IDE_PM_FLUSH_CACHE: /* Suspend step 1 (flush cache) */
91 if (pm->pm_state == PM_EVENT_FREEZE)
92 pm->pm_step = IDE_PM_COMPLETED;
93 else
94 pm->pm_step = IDE_PM_STANDBY;
95 break;
96 case IDE_PM_STANDBY: /* Suspend step 2 (standby) */
97 pm->pm_step = IDE_PM_COMPLETED;
98 break;
99 case IDE_PM_RESTORE_PIO: /* Resume step 1 (restore PIO) */
100 pm->pm_step = IDE_PM_IDLE;
101 break;
102 case IDE_PM_IDLE: /* Resume step 2 (idle)*/
103 pm->pm_step = IDE_PM_RESTORE_DMA;
104 break;
105 }
106}
107
108ide_startstop_t ide_start_power_step(ide_drive_t *drive, struct request *rq)
109{
110 struct request_pm_state *pm = rq->data;
111 struct ide_cmd *cmd = rq->special;
112
113 memset(cmd, 0, sizeof(*cmd));
114
115 switch (pm->pm_step) {
116 case IDE_PM_FLUSH_CACHE: /* Suspend step 1 (flush cache) */
117 if (drive->media != ide_disk)
118 break;
119 /* Not supported? Switch to next step now. */
120 if (ata_id_flush_enabled(drive->id) == 0 ||
121 (drive->dev_flags & IDE_DFLAG_WCACHE) == 0) {
122 ide_complete_power_step(drive, rq);
123 return ide_stopped;
124 }
125 if (ata_id_flush_ext_enabled(drive->id))
126 cmd->tf.command = ATA_CMD_FLUSH_EXT;
127 else
128 cmd->tf.command = ATA_CMD_FLUSH;
129 goto out_do_tf;
130 case IDE_PM_STANDBY: /* Suspend step 2 (standby) */
131 cmd->tf.command = ATA_CMD_STANDBYNOW1;
132 goto out_do_tf;
133 case IDE_PM_RESTORE_PIO: /* Resume step 1 (restore PIO) */
134 ide_set_max_pio(drive);
135 /*
136 * skip IDE_PM_IDLE for ATAPI devices
137 */
138 if (drive->media != ide_disk)
139 pm->pm_step = IDE_PM_RESTORE_DMA;
140 else
141 ide_complete_power_step(drive, rq);
142 return ide_stopped;
143 case IDE_PM_IDLE: /* Resume step 2 (idle) */
144 cmd->tf.command = ATA_CMD_IDLEIMMEDIATE;
145 goto out_do_tf;
146 case IDE_PM_RESTORE_DMA: /* Resume step 3 (restore DMA) */
147 /*
148 * Right now, all we do is call ide_set_dma(drive),
149 * we could be smarter and check for current xfer_speed
150 * in struct drive etc...
151 */
152 if (drive->hwif->dma_ops == NULL)
153 break;
154 /*
155 * TODO: respect IDE_DFLAG_USING_DMA
156 */
157 ide_set_dma(drive);
158 break;
159 }
160
161 pm->pm_step = IDE_PM_COMPLETED;
162
163 return ide_stopped;
164
165out_do_tf:
166 cmd->valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE;
167 cmd->valid.in.tf = IDE_VALID_IN_TF | IDE_VALID_DEVICE;
168 cmd->protocol = ATA_PROT_NODATA;
169
170 return do_rw_taskfile(drive, cmd);
171}
172
173/**
174 * ide_complete_pm_rq - end the current Power Management request
175 * @drive: target drive
176 * @rq: request
177 *
178 * This function cleans up the current PM request and stops the queue
179 * if necessary.
180 */
181void ide_complete_pm_rq(ide_drive_t *drive, struct request *rq)
182{
183 struct request_queue *q = drive->queue;
184 struct request_pm_state *pm = rq->data;
185 unsigned long flags;
186
187 ide_complete_power_step(drive, rq);
188 if (pm->pm_step != IDE_PM_COMPLETED)
189 return;
190
191#ifdef DEBUG_PM
192 printk("%s: completing PM request, %s\n", drive->name,
193 blk_pm_suspend_request(rq) ? "suspend" : "resume");
194#endif
195 spin_lock_irqsave(q->queue_lock, flags);
196 if (blk_pm_suspend_request(rq))
197 blk_stop_queue(q);
198 else
199 drive->dev_flags &= ~IDE_DFLAG_BLOCKED;
200 spin_unlock_irqrestore(q->queue_lock, flags);
201
202 drive->hwif->rq = NULL;
203
204 if (blk_end_request(rq, 0, 0))
205 BUG();
206}
207
208void ide_check_pm_state(ide_drive_t *drive, struct request *rq)
209{
210 struct request_pm_state *pm = rq->data;
211
212 if (blk_pm_suspend_request(rq) &&
213 pm->pm_step == IDE_PM_START_SUSPEND)
214 /* Mark drive blocked when starting the suspend sequence. */
215 drive->dev_flags |= IDE_DFLAG_BLOCKED;
216 else if (blk_pm_resume_request(rq) &&
217 pm->pm_step == IDE_PM_START_RESUME) {
218 /*
219 * The first thing we do on wakeup is to wait for BSY bit to
220 * go away (with a looong timeout) as a drive on this hwif may
221 * just be POSTing itself.
222 * We do that before even selecting as the "other" device on
223 * the bus may be broken enough to walk on our toes at this
224 * point.
225 */
226 ide_hwif_t *hwif = drive->hwif;
227 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
228 struct request_queue *q = drive->queue;
229 unsigned long flags;
230 int rc;
231#ifdef DEBUG_PM
232 printk("%s: Wakeup request inited, waiting for !BSY...\n", drive->name);
233#endif
234 rc = ide_wait_not_busy(hwif, 35000);
235 if (rc)
236 printk(KERN_WARNING "%s: bus not ready on wakeup\n", drive->name);
237 tp_ops->dev_select(drive);
238 tp_ops->write_devctl(hwif, ATA_DEVCTL_OBS);
239 rc = ide_wait_not_busy(hwif, 100000);
240 if (rc)
241 printk(KERN_WARNING "%s: drive not ready on wakeup\n", drive->name);
242
243 spin_lock_irqsave(q->queue_lock, flags);
244 blk_start_queue(q);
245 spin_unlock_irqrestore(q->queue_lock, flags);
246 }
247}